Package org.apache.camel.util.concurrent

Class SizedScheduledExecutorService

java.lang.Object

org.apache.camel.util.concurrent.SizedScheduledExecutorService

All Implemented Interfaces:

Executor, ExecutorService, ScheduledExecutorService

public class SizedScheduledExecutorService
extends Object
implements ScheduledExecutorService

A sized ScheduledExecutorService which will reject executing tasks if the task queue is full.

The ScheduledThreadPoolExecutor which is the default implementation of the ScheduledExecutorService has unbounded task queue, which mean you can keep scheduling tasks which may cause the system to run out of memory.

This class is a wrapped for ScheduledThreadPoolExecutor to reject executing tasks if an upper limit of the task queue has been reached.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	QUEUE_SIZE_LIMIT_REACHED

Constructor Summary

Constructors

Constructor	Description
SizedScheduledExecutorService(ScheduledThreadPoolExecutor delegate, long queueSize)	Creates a new sized ScheduledExecutorService with the given queue size as upper task limit.

Method Summary

Modifier and Type	Method	Description
void	allowCoreThreadTimeOut(boolean value)
boolean	allowsCoreThreadTimeOut()
boolean	awaitTermination(long timeout, TimeUnit timeUnit)
protected boolean	canScheduleOrExecute()	Can the task be scheduled or executed?
void	execute(Runnable task)
int	getActiveCount()
long	getCompletedTaskCount()
int	getCorePoolSize()
long	getKeepAliveTime(TimeUnit timeUnit)
int	getLargestPoolSize()
int	getMaximumPoolSize()
int	getPoolSize()
RejectedExecutionHandler	getRejectedExecutionHandler()
ScheduledThreadPoolExecutor	getScheduledThreadPoolExecutor()	Gets the wrapped ScheduledThreadPoolExecutor
long	getTaskCount()
ThreadFactory	getThreadFactory()
<T> List<Future<T>>	invokeAll(Collection<? extends Callable<T>> tasks)
<T> List<Future<T>>	invokeAll(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit timeUnit)
<T> T	invokeAny(Collection<? extends Callable<T>> tasks)
<T> T	invokeAny(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit timeUnit)
boolean	isShutdown()
boolean	isTerminated()
boolean	isTerminating()
int	prestartAllCoreThreads()
boolean	prestartCoreThread()
void	purge()
ScheduledFuture<?>	schedule(Runnable task, long delay, TimeUnit timeUnit)
<V> ScheduledFuture<V>	schedule(Callable<V> task, long delay, TimeUnit timeUnit)
ScheduledFuture<?>	scheduleAtFixedRate(Runnable task, long initialDelay, long period, TimeUnit timeUnit)
ScheduledFuture<?>	scheduleWithFixedDelay(Runnable task, long initialDelay, long period, TimeUnit timeUnit)
void	setCorePoolSize(int corePoolSize)
void	setKeepAliveTime(long keepAliveTime, TimeUnit timeUnit)
void	setMaximumPoolSize(int maximumPoolSize)
void	setRejectedExecutionHandler(RejectedExecutionHandler rejectedExecutionHandler)
void	setThreadFactory(ThreadFactory threadFactory)
void	shutdown()
List<Runnable>	shutdownNow()
Future<?>	submit(Runnable task)
<T> Future<T>	submit(Runnable task, T result)
<T> Future<T>	submit(Callable<T> task)
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

QUEUE_SIZE_LIMIT_REACHED

public static final String QUEUE_SIZE_LIMIT_REACHED

See Also:

• Constant Field Values

Constructor Details

SizedScheduledExecutorService

public SizedScheduledExecutorService(ScheduledThreadPoolExecutor delegate,
 long queueSize)

Creates a new sized ScheduledExecutorService with the given queue size as upper task limit.

Parameters:

delegate - the delegate of the actual thread pool implementation

queueSize - the upper queue size, use 0 or negative value for unlimited

Method Details

getScheduledThreadPoolExecutor

public ScheduledThreadPoolExecutor getScheduledThreadPoolExecutor()

Gets the wrapped ScheduledThreadPoolExecutor

schedule

public <V> ScheduledFuture<V> schedule(Callable<V> task,
 long delay,
 TimeUnit timeUnit)

Specified by:

schedule in interface ScheduledExecutorService

schedule

public ScheduledFuture<?> schedule(Runnable task,
 long delay,
 TimeUnit timeUnit)

Specified by:

schedule in interface ScheduledExecutorService

scheduleAtFixedRate

public ScheduledFuture<?> scheduleAtFixedRate(Runnable task,
 long initialDelay,
 long period,
 TimeUnit timeUnit)

Specified by:

scheduleAtFixedRate in interface ScheduledExecutorService

scheduleWithFixedDelay

public ScheduledFuture<?> scheduleWithFixedDelay(Runnable task,
 long initialDelay,
 long period,
 TimeUnit timeUnit)

Specified by:

scheduleWithFixedDelay in interface ScheduledExecutorService

awaitTermination

public boolean awaitTermination(long timeout,
 TimeUnit timeUnit)
                         throws InterruptedException

Specified by:

awaitTermination in interface ExecutorService

Throws:

InterruptedException

getActiveCount

public int getActiveCount()

getCompletedTaskCount

public long getCompletedTaskCount()

getCorePoolSize

public int getCorePoolSize()

getKeepAliveTime

public long getKeepAliveTime(TimeUnit timeUnit)

getLargestPoolSize

public int getLargestPoolSize()

getMaximumPoolSize

public int getMaximumPoolSize()

getPoolSize

public int getPoolSize()

getRejectedExecutionHandler

public RejectedExecutionHandler getRejectedExecutionHandler()

getTaskCount

public long getTaskCount()

getThreadFactory

public ThreadFactory getThreadFactory()

invokeAll

public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks)
                              throws InterruptedException

Specified by:

invokeAll in interface ExecutorService

Throws:

InterruptedException

invokeAll

public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks,
 long timeout,
 TimeUnit timeUnit)
                              throws InterruptedException

Specified by:

invokeAll in interface ExecutorService

Throws:

InterruptedException

invokeAny

public <T> T invokeAny(Collection<? extends Callable<T>> tasks)
                throws InterruptedException,
ExecutionException

Specified by:

invokeAny in interface ExecutorService

Throws:

InterruptedException

ExecutionException

invokeAny

public <T> T invokeAny(Collection<? extends Callable<T>> tasks,
 long timeout,
 TimeUnit timeUnit)
                throws InterruptedException,
ExecutionException,
TimeoutException

Specified by:

invokeAny in interface ExecutorService

Throws:

InterruptedException

ExecutionException

TimeoutException

isShutdown

public boolean isShutdown()

Specified by:

isShutdown in interface ExecutorService

isTerminated

public boolean isTerminated()

Specified by:

isTerminated in interface ExecutorService

isTerminating

public boolean isTerminating()

prestartAllCoreThreads

public int prestartAllCoreThreads()

prestartCoreThread

public boolean prestartCoreThread()

purge

public void purge()

setCorePoolSize

public void setCorePoolSize(int corePoolSize)

setKeepAliveTime

public void setKeepAliveTime(long keepAliveTime,
 TimeUnit timeUnit)

setMaximumPoolSize

public void setMaximumPoolSize(int maximumPoolSize)

setRejectedExecutionHandler

public void setRejectedExecutionHandler(RejectedExecutionHandler rejectedExecutionHandler)

setThreadFactory

public void setThreadFactory(ThreadFactory threadFactory)

shutdown

public void shutdown()

Specified by:

shutdown in interface ExecutorService

shutdownNow

public List<Runnable> shutdownNow()

Specified by:

shutdownNow in interface ExecutorService

submit

public <T> Future<T> submit(Callable<T> task)

Specified by:

submit in interface ExecutorService

submit

public Future<?> submit(Runnable task)

Specified by:

submit in interface ExecutorService

submit

public <T> Future<T> submit(Runnable task,
 T result)

Specified by:

submit in interface ExecutorService

execute

public void execute(Runnable task)

Specified by:

execute in interface Executor

allowCoreThreadTimeOut

public void allowCoreThreadTimeOut(boolean value)

allowsCoreThreadTimeOut

public boolean allowsCoreThreadTimeOut()

canScheduleOrExecute

protected boolean canScheduleOrExecute()

Can the task be scheduled or executed?

Returns:

true to accept, false to not accept

toString

public String toString()

Overrides:

toString in class Object